All posts by Parker

128×32 DMD Verilog Code

August 14, 2011 Parker

Here is some Verilog code for a 32×128 DMD I am designing.


module LED_Matrix_32x128
(
clk,e_cnt,row_cnt,col,SDRAM_CS,SRAM_CS,LAT,DATA,SCLK
);

input  wire    clk;
input  wire    LAT;
input  wire    DATA;
input  wire    SCLK;

output  reg [63:0]  col;
output  reg [0:0]   SDRAM_CS;
output  reg [0:0]   SRAM_CS;
output  reg [5:0]  row_cnt;
output  reg [4:0]  e_cnt;

reg [24:0]  clk_slow;
reg [4096:0]  col_buffer;
reg [63:0]  col_temp [63:0];

initial
begin
col &lt;= 16'b0000000000000000;
    SDRAM_CS &lt;= 1'b0;
    SRAM_CS &lt;= 1'b0;
    clk_slow &lt;= 16'b0000000000000000;
    row_cnt &lt;= 5'b00000;
    e_cnt &lt;= 4'b1000;
  end

always @(posedge clk) clk_slow=clk_slow + 1'b1;  

always @(posedge clk_slow[10]) 
begin
  if(row_cnt &gt; 5'b01111)
begin
row_cnt &lt;= 5'b00000;
    e_cnt &lt;= {row[2:0],row[3]};
  end
  col &lt;= col_temp[row_cnt];  
  row_cnt &lt;= row_cnt + 1'b1;
end

always @(posedge SCLK)
begin
  if(LAT)
  begin
    col_buffer &lt;= {col_buffer[4094:0],DATA[0]};
  end
  else
  begin
    col_temp [0] &lt;= col_buffer [4095:4032];
    col_temp [1] &lt;= col_buffer [4031:3968];
    col_temp [2] &lt;= col_buffer [3967:3904];
    col_temp [3] &lt;= col_buffer [3903:3840];
    col_temp [4] &lt;= col_buffer [3839:3776];
    col_temp [5] &lt;= col_buffer [3775:3712];
    col_temp [6] &lt;= col_buffer [3711:3648];
    col_temp [7] &lt;= col_buffer [3647:3584];
    col_temp [8] &lt;= col_buffer [3583:3520];
    col_temp [9] &lt;= col_buffer [3519:3456];
    col_temp [10] &lt;= col_buffer [3455:3392];
    col_temp [11] &lt;= col_buffer [3391:3328];
    col_temp [12] &lt;= col_buffer [3327:3264];
    col_temp [13] &lt;= col_buffer [3263:3200];
    col_temp [14] &lt;= col_buffer [3199:3136];
    col_temp [15] &lt;= col_buffer [3135:3072];
    col_temp [16] &lt;= col_buffer [3071:3008];
    col_temp [17] &lt;= col_buffer [3007:2944];
    col_temp [18] &lt;= col_buffer [2943:2880];
    col_temp [19] &lt;= col_buffer [2879:2816];
    col_temp [20] &lt;= col_buffer [2815:2752];
    col_temp [21] &lt;= col_buffer [2751:2688];
    col_temp [22] &lt;= col_buffer [2687:2624];
    col_temp [23] &lt;= col_buffer [2623:2560];
    col_temp [24] &lt;= col_buffer [2559:2496];
    col_temp [25] &lt;= col_buffer [2495:2432];
    col_temp [26] &lt;= col_buffer [2431:2368];
    col_temp [27] &lt;= col_buffer [2367:2304];
    col_temp [28] &lt;= col_buffer [2303:2240];
    col_temp [29] &lt;= col_buffer [2239:2176];
    col_temp [30] &lt;= col_buffer [2175:2112];
    col_temp [31] &lt;= col_buffer [2111:2048];
    col_temp [32] &lt;= col_buffer [2047:1984];
    col_temp [33] &lt;= col_buffer [1983:1920];
    col_temp [34] &lt;= col_buffer [1919:1856];
    col_temp [35] &lt;= col_buffer [1855:1792];
    col_temp [36] &lt;= col_buffer [1791:1728];
    col_temp [37] &lt;= col_buffer [1727:1664];
    col_temp [38] &lt;= col_buffer [1663:1600];
    col_temp [39] &lt;= col_buffer [1599:1536];
    col_temp [40] &lt;= col_buffer [1535:1472];
    col_temp [41] &lt;= col_buffer [1471:1408];
    col_temp [42] &lt;= col_buffer [1407:1344];
    col_temp [43] &lt;= col_buffer [1343:1280];
    col_temp [44] &lt;= col_buffer [1279:1216];
    col_temp [45] &lt;= col_buffer [1215:1152];
    col_temp [46] &lt;= col_buffer [1151:1088];
    col_temp [47] &lt;= col_buffer [1087:1024];
    col_temp [48] &lt;= col_buffer [1023:960];
    col_temp [49] &lt;= col_buffer [959:896];
    col_temp [50] &lt;= col_buffer [895:832];
    col_temp [51] &lt;= col_buffer [831:768];
    col_temp [52] &lt;= col_buffer [767:704];
    col_temp [53] &lt;= col_buffer [703:640];
    col_temp [54] &lt;= col_buffer [639:576];
    col_temp [55] &lt;= col_buffer [575:512];
    col_temp [56] &lt;= col_buffer [511:448];
    col_temp [57] &lt;= col_buffer [447:384];
    col_temp [58] &lt;= col_buffer [383:320];
    col_temp [59] &lt;= col_buffer [319:256];
    col_temp [60] &lt;= col_buffer [255:192];
    col_temp [61] &lt;= col_buffer [191:128];
    col_temp [62] &lt;= col_buffer [127:64];
    col_temp [63] &lt;= col_buffer [63:0];
  end
end
endmodule

Categories: Pinball

Reset Vector: New main board

August 8, 2011 Parker

A work in progress. Some of the new features include a socketable Propeller Chip, lockable headers, and separate power lines for the microcontroller and other sub systems. These changes will make the system easier to fix and prevent future problems.

Categories: Pinball, RESET_VECTOR

RESET VECTOR: DMD 16×96 Single Line Test

August 7, 2011 Parker

I finally finished building the Dot Matrix Display for Reset Vector. The Matrixing is run by a FPGA. The data is shifted in by the main propeller microcontroller. Currently the only code on the propeller is the single line text generator. I have a double line text generator and a animation driver that will load bitmaps off an SD card.

The Code will be up tomorrow.

Categories: Pinball, RESET_VECTOR

Reset Vector : LED DMD done!

July 26, 2011 Parker

Just got it working.

Categories: Pinball, RESET_VECTOR

Atari 2600 Cart 2K/4K PCB

July 26, 2011 Parker

Here is a Atari 2600 Cart PCB. It is the basic 2K/4K EEPROM. I don’t have the PCB files uploaded yet but you can download the CAM files. This is free for anyone to use, sell, and/or distribute.

Download Link

I will be uploading the PCB files in a week or so when I get back from my vacation. I use FreePCB. I will be uploading my custom footprint library as well so people can open the files.

Categories: Breakout Boards, PCBA & ENG

WS2801 – 3 Channel PWM

July 22, 2011 Parker

The WS2801 is a 3-channel constant current LED drivers that is designed for controlling chains of RGB LEDs. The IC is controlled by a 2-wire serial control scheme that allows multiple WS2801 to be chained together. You can find the WS2801 in the link below. This demo code basically shifts out 24 bits (8bits per color) using a 2-wire protocol. This code only works for one WS2801. There is a object designed for multiple WS2801 already in the propeller OBEX. That design uses too many resources for use on my pinball machine so I wrote this to use as little resources as possible (no new cog).

The idea would be to have the WS2801 PWM a set of mosfets which would in turn be connected to the string of LEDs. This way you could light up a bunch of RGB LEDs without allot of CPU time taken from the Propeller. The Propeller only has to mess with the WS2801 when it needs to change the PWM signals.

Where to buy the WS2801.
Demo Driver

http://www.youtube.com/watch?v=EugcTOxVHx8

Categories: Appnotes, PCBA & ENG

LDMD 16×96 PCB and FPGA working!

July 21, 2011 Parker

I soldered on what parts I had on hand and got the DMD display working today. Will upload the code after I get all the modules soldered on.

Categories: Pinball, RESET_VECTOR

LDMD 16×16 Propeller Comm Test

July 21, 2011 Parker

Just finished the DMD (Dot Matrix Display) test for RESET_VECTOR. Since the Propeller is to slow to do the matrixing I am going to use a FPGA to do it. The propeller will send the data over a serial connection into a frame buffer on the FPGA. When all the data is on the FPGA the FPGA will update its matrixing buffer.

I have the Propeller to FPGA communication protocol written and tested as well. The Propeller loads the Data off the SD card and sends it serially to the FPGA.

http://www.youtube.com/watch?v=FGHIM8qgff8

http://www.youtube.com/watch?v=hrf3yXOP-KM

Propeller Code
FPGA Code
Block Diagram of the Dot Matrix.

Categories: Pinball, RESET_VECTOR

NES 2 Video mod Schematic

July 19, 2011 Parker

So the NES 2 only outputs RF which isn’t good when you want to portabilize it or use it with modern Tvs. Most composite mods out there don’t really do a good job at fixing the issue as there is some vertical lines that show up. This mod does not have any vertical lines.